Cholesterol, though it is not an energy molecule, has importance in the body because it ________. cholesterol, though it is not an energy molecule, has importance in the body because it ________. helps provide essential nutrients to the brain and lungs helps mobilize fats during periods of starvation is a stabilizing component of the plasma membranes and is the parent molecule of steroid hormones enters the glycolytic pathway without being altered
Final answer:
Cholesterol is vital for the body as it is integral to cell membrane stability and functions as a precursor to steroid hormones, vitamin D, and bile salts necessary for fat digestion.
Explanation:
Cholesterol, though it is not an energy molecule, has importance in the body because it is a stabilizing component of the plasma membranes and is the parent molecule of steroid hormones. Cholesterol is essential for the proper functioning of the body, despite its negative reputation among laypeople.
It not only supports the structure of plasma membranes in animal cells but also serves as a precursor for vital biological molecules such as hormones (testosterone, estrogen, progesterone), vitamin D, and bile salts which are crucial for emulsification and absorption of fats. Additionally, cholesterol is involved in signaling processes and is a key component in nerve cells.
How do lichens alter the abiotic environments to favor the establishment of other species of plants?
A. They are a good food source for pollinators.
B. They reflect sunlight to help then to grow.
C. They break down rock and form soil.
The correct answer is C. They break down rock and form soil.
The lichens are an example which shows mutualism and they are found in every biome of the Earth.
The lichens have algae and fungus associated with them and they live in a mutualistic relationship with each other. Lichens can grow on soil where no other species can grow like rocks, barren soils and they enrich the soil on dying where other plants and trees can grow.
Lichens being pioneer species change the environment by building up the soil and liberating nutrients. Also the lichens contribute to the chemical weathering of the soil releasing phosphate along with erosion and weather conditions.
When the simple plants die, the wildflowers and other plants start growing replacing lichens or mosses.
From the given information it can be concluded that lichens alter the abiotic environment and favor other species of plants to grow by breaking down rocks from soil and providing nutrients.
How can limiting nonpoint sources of oil pollution help to keep the oceans clean?
Two species of ant compete for limited resources in a front yard until only one species is able to remain. this is an example of __________.
How are Protista different from bacteria?
A) Protista reproduce asexually and bacteria do not.
B) Protista are heterotrophic and bacteria are not.
C) Protista have cilia and bacteria do not.
D) Protista have nuclei and bacteria do not.
Protists (algae) are single-celled eukaryotes. They are different from bacteria as they have nuclei in their cells, but bacteria lack distinct nuclei. Thus, option D is correct.
What are protists and bacteria?Protists are the algae that belong to the eukaryotes and have a distinct nucleus or nucleus enclosed in the nuclear membrane. The nuclear membrane protects the nuclei from enzymes.
Bacteria are prokaryotic organisms that are single-celled and do not have a distinct nuclei and rather the genetic material lies in the cytoplasm in the free state.
Therefore, the protists have a defined nucleus.
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All but one factor contributes to water pollution. That factor is
You flip on a lamp switch what type of energy is used
Certain neurons seem to be wired to detect certain angles, lines, edges, and movements. for example, we can quickly detect the features of a human face and interpret the expression on that face. the nerve cells that respond to these specific features are called:
Answer:
feature detectors
Explanation:
im taking the quiz rn
edit: spelling
Look at the two images of cells. mc020-1.jpg Which of the following statements best describes what can be seen in the images? Image A represents a peptide hormone that interacts with a receptor, and image B represents a steroid hormone that interacts with the cell’s DNA. Image A represents a steroid hormone that interacts with the cell’s DNA, and image B represents a peptide hormone that interacts with a receptor. Image A represents an endocrine hormone that interacts with a receptor, and image B represents an exocrine hormone that interacts with the cell’s DNA. Image A represents an exocrine hormone that interacts with the cell’s DNA, and image B represents an endocrine hormone that interacts with a receptor.
The statement which best describes what can be seen in the images is: Option A.
What is an endocrine system?An endocrine system refers to series of ductless glands and organs found in the body of a living organism and they are saddled with the responsiblity of producting and secreting hormones, especially for the performance of various life functions such as:
GrowthReproductionMetabolismMoodSleepBased on the image, we can deduce that image A illustrates a peptide hormone that is interacting with a receptor while image B shows a steroid hormone that interacts with the cell's deoxyribonucleic acid (DNA).
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What it called when daughter cells get an exact copy of dna from the parent cell
The diversity of human eye color can be explained by understanding
Final answer:
The diversity in human eye color is due to complex, non-Mendelian inheritance patterns, specifically polygenic inheritance. Multiple genes contribute to the amount of melanin produced, which determines the eye color variety. Environmental factors also play a role in this phenotypic diversity.
Explanation:
Understanding the Diversity of Human Eye Color
The diversity of human eye color such as green, blue, brown, black, hazel, violet, and grey can be linked to complex patterns of inheritance beyond the simple ones Mendel observed. This is due to non-Mendelian inheritance, which refers to genetic principles that cannot be explained by Mendel's laws of inheritance alone. In the case of human eye color, polygenic inheritance is at play, where multiple genes contribute to the resulting phenotype.
Specifically, genetic adaptations and variations in the human genome influence the amount and type of melanin produced, which in turn determines eye color. Genome studies have identified numerous genes related to pigmentation, and the interplay among these genes can create the vast array of eye colors observed. These genes include, but are not limited to, TYR, OCA2/HERC2, TYRP1, SLC45A2, and HPS6i.
Environmental factors also contribute to phenotypic diversity. Adaptations to ultraviolet (UV) radiation levels across different geographical regions have influenced melanin production over time. However, eye color variation remains notably subject to a range of genetic combinations due to its polygenic nature, leading to the vast spectrum we see in human populations.
Which of the following remains relatively constant in an ecosystem? A.number of organisms B.amount of matter C.number of species
Answer:
It is amount of matter
Explanation:
The amount of matter remains relatively constant in an ecosystem. Thus, the correct option for this question is B.
What is an ecosystem?An ecosystem may be characterized as a type of place or an area where individuals of different species live together and interact with one another for the purpose of food, shelter, space, resource, mating partners, etc.
The amount of matter within the ecosystem always remains constant. It neither gets eliminated nor added to the ecosystem, although it gets changed from one form to another during the life cycle of an organism.
The organisms within an established ecosystem interact and form relationships with each other over time. This interdependence allows ecosystems to remain relatively stable for hundreds and sometimes thousands of years.
Therefore, the amount of matter remains relatively constant in an ecosystem. Thus, the correct option for this question is B.
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Where does mechanical breakdown of food occurs?
Smoke from the lit end of a cigarette has ____ concentrations of carcinogens and nicotine compared to cigarette smoke exhaled from the lungs of a smoker.
Sara and juan conducted an experiment to test which soil would be best for growing plants. they planted bean seeds in four pots and placed the pots in the sunlight. each pot had a different type of soil. they used all three types of soil seen in the jar: sand, silt, and clay. they also made a mixture of soil using equal parts of sand, silt, and clay. once the seeds were planted, the watered the pots every day and tracked the seed germination and plant growth. what was the dependent variable in the experiment
The dependent variable in the Sara and Juan experiment was seed germination and therefore plant growth.
What is the dependent variable?The dependent variable is the experimental variable we need to measure in the experiment.
The independent variable does not change along with the experimental conditions.In conclusion, the dependent variable in the Sara and Juan experiment was seed germination and therefore plant growth.
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What type of mutation is most likely to result from the deamination of cytosine in a gc base pair (if left unrepaired)?
how does DNA evidence support the theory of evolution
Substances that plug up an enzyme's active site are ________.
Which structures regulate water loss and gas exchange in the leaves of plants
Final answer:
Stomata and guard cells are the primary structures in leaves that regulate water loss and gas exchange, with the waxy cuticle and trichomes providing additional support in minimizing transpiration and protecting the leaf.
Explanation:
The structures that regulate water loss and gas exchange in the leaves of plants are known as stomata and guard cells. The stomata are small openings primarily located on the underside of the leaf to minimize water loss. These stomata enable the exchange of gases, allowing carbon dioxide in and letting oxygen out for the process of photosynthesis. Guard cells flank each stoma and are responsible for their opening and closing. They react to various environmental cues like light intensity, leaf water status, and carbon dioxide concentrations, helping to maintain a balance between efficient photosynthesis and conservation of water.
In addition to stomata and guard cells, the leaves are covered by a waxy cuticle which also serves to prevent water loss. Other structures like trichomes, which are hair-like structures on the epidermal surface of the leaf, contribute to reducing water loss through transpiration, increasing solar reflectance, and storing compounds that fend off herbivores.
The property of water that accounts for the ability of liquid water to absorb large amounts of heat and change relatively little in temperature is called
If the mass of a material is 43 grams and the volume of the material is 11 cm 3, what would the density of the material be?
what is biotechnology
Biotechnology is the exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms. The exploitation of biological processes for industrial and other purposes, especially the genetic manipulation of microorganisms for the production of antibiotics, hormones, etc.
Biotechnology can be defined as the controlled and deliberate manipulation of biological systems for the efficient manufacture or processing of useful products. The fact that living organisms have evolved such an enormous spectrum of biological capabilities means that by choosing appropriate organisms it is possible to obtain a wide variety of substances, many of which are useful to man as food, fuel and medicines. Over the past 30 years, biologists have increasingly applied the methods of physics, chemistry and mathematics in order to gain precise knowledge, at the molecular level, of how living cells make these substances. By combining this newly-gained knowledge with the methods of engineering and science, what has emerged is the concept of biotechnology which embraces all of the above-mentioned disciplines.
Biotechnology is the use of organisms and biological processes to create technological applications that serve human needs, particularly in the areas of agriculture, medicine, and food science.
Biotechnology is the application of technology to manipulate the genetic material of living organisms to produce new products or improve existing ones. This field combines various aspects of biology with cutting-edge technology to create products that benefit humanity in fields such as agriculture, food science, and medicine. Through methods like genetic engineering, scientists can create crops with higher yields, plants that can resist pests and advanced medical treatments like gene therapy.
Biotechnology is not a new concept; in fact, humans have utilized this science in simpler forms throughout history, such as in the making of cheese, wine, yogurt, and beer using microorganisms like yeast. However, modern advancements allow for more precise alterations at the genetic level. This enables the production of antibiotics, the cultivation of cell cultures for research, and the potential for curing genetic disorders through gene therapy.
The current system of classification includes which three domains?
Cooking oil lipids consist of long, unsaturated hydrocarbon chains. would you expect these molecules to form membranes spontaneously? why or why not?
Cooking oil lipids consisting of long, unsaturated hydrocarbon chains are not expected to spontaneously form membranes. Membranes require phospholipids with both polar heads and nonpolar tails, which are not present in cooking oil lipids.
Explanation:Long, unsaturated hydrocarbon chains in cooking oil lipids make them unlikely to form membranes spontaneously. Membranes are typically composed of phospholipids, which have a polar head and nonpolar tails. While cooking oil lipids do have nonpolar hydrocarbon chains, they do not possess the polar head that is necessary for the formation of membranes. Therefore, they are not capable of forming membranes on their own.
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In the 1990s, scientists used satellite images to locate a giant asteroid crater in the Gulf of Mexico. The crater, named Chicxulub, was formed about 65 million years ago. After discovering the crater, scientists used computer programs to model the effects of the asteroid's impact on the planet. Why did scientists have to use a model in order to study the asteroid's effects?
Answer:
the event occurred too long to study directly
Explanation:
study island
A researcher has discovered a new species of bacteria that is remarkably similar to
e. coli in its morphology and rrna sequences. how should the bacteria be classified?
A drop of whiskey on your tongue can be detected in your arm in:
Answer:
The correct answer is seven seconds.
Explanation:
When an individual consumes an alcoholic beverage, about twenty percent of the alcohol gets captivated in the stomach and the rest eighty percent get absorbed in the small intestine. The rate of the absorption of alcohol relies upon many things, that is, the concentration of the alcohol in the beverage, the kind of drink, and that whether the stomach is full or empty as food slows down the absorption of alcohol.
After getting absorbed, the alcohol moves into the bloodstream and gets dissolved in the water of the blood. The blood mediates alcohol all through the body. From the blood, the alcohol then enters and gets dissolved in the water within each and every tissue of the body.
If one takes a whiskey shot and holds it on the tongue than that whiskey moves through the walls of the tongue, the esophagus and then eventually the stomach. However, a shot of whiskey can be detected in the arms when is consumed on an empty stomach, and It touches every prime section of the body within 2 minutes.
If a is dominant to a and b is dominant to b, what is the expected phenotypic ratio of the cross aabb × aabb? if a is dominant to a and b is dominant to b, what is the expected phenotypic ratio of the cross aabb × aabb? 9:3:3:1 1:1:1:1 16:0:0:0 8:4:2:2
The cross of two homozygous recessive entities (aabb x aabb) will result in offspring all bearing the 100% recessive traits pattern. The phenotypic ratio would therefore be represented as 1:0:0:0.
Explanation:If we consider that both the 'a' and 'b' traits are homozygous recessive (aabb), the cross of aabb x aabb will result in the offspring also being homozygous recessive (aabb). Since the traits 'a' and 'b' show simple dominance where 'A' and 'B' are dominant to 'a' and 'b', but we only have 'a' and 'b' present, the resulting offspring will only exhibit the recessive traits. Therefore, the phenotypic ratio would be 100% expressing the recessive traits. To put it in terms of ratios like those offered in the question, that would be 1:0:0:0.
Let's elaborate it further. Mendel's third-generation phenotype ratio of 3:1 can be understood in the context of Aa × Aa cross. In these instances, both AA and Aa individuals express the dominant trait and are counted together thereby leading to the typical 3:1 ratio (dominant:recessive). However, with aabb x aabb, all the parents' gametes are recessive and so all the offspring will also be homozygous recessive, deviating from the traditional Mendelian ratio.
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What is the spread of desert like conditions called?
How does planting trees help maintain the supply of forestland for a longer period of time?
A.Planting increases the supply of wood.
B.Planting increases the cost of wood.
C.Planting reduces the demand for wood.
D.Planting reduces the consumption of wood.
Answer:
A. Planting increases the supply of wood. (APEX)
Explanation: